package com.hzk.gulimall.product.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hzk.common.utils.PageUtils;
import com.hzk.common.utils.Query;

import com.hzk.gulimall.product.dao.CategoryDao;
import com.hzk.gulimall.product.entity.CategoryEntity;
import com.hzk.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

//    @Autowired(required = false)
//    CategoryDao categoryDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查出所有分类
        List<CategoryEntity> categoryEntities = baseMapper.selectList(null);

        //2.组装成父子的树形结构
        //2.1)找到所有的一级分类
        /*List<CategoryEntity> level1Menu = categoryEntities.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid() == 0;
        }).collect(Collectors.toList());*/

        //2.2)找到一级分类和子菜单
        List<CategoryEntity> level1Menu = categoryEntities.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid() == 0;
        }).map((menu)->{
            menu.setChildren(getChildrenTree(menu,categoryEntities));
            return menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return level1Menu;
    }

    /**
     * 递归查找所有菜单的子菜单
     * @param root
     * @param all
     * @return
     */
    private List<CategoryEntity> getChildrenTree(CategoryEntity root,List<CategoryEntity> all){

        List<CategoryEntity> children = all.stream().filter((categoryEntity) -> {
            //传入根节点和菜单实体集合,过滤得到父id = 根节点的id 的菜单all
            return categoryEntity.getParentCid() == root.getCatId();
        }).map((categoryEntity) -> {
            //每个菜单打包成map,递归添加子菜单
            categoryEntity.setChildren(getChildrenTree(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            //菜单排序
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }

}